Hitachi RAC-10SH1 Service Manual Download Page 97

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RAS-10SH1

RAS-14SH1

MODEL

RAS-10SH1, RAS-14SH1

NO.

PARTS NO.

PARTS NAME

Q’TY/UNIT

27
28
29
30
31

GEAR ASSEMBLY

AUTO SWEEP MOTOR(GEAR)

LIMIT SWITCH
IONIZER UNIT

IONIZER CASING

THERMISTOR SUPPORT

SCREW CAP (B)

SCREW CAP (W)

HWRAS-25WX8B A07

HWRAS-25WX8 A33

HWRAS-25WX8 A26
HWRAS-25WX8 A27

HWRAS-25WX8 A28

HWRAS-25WX8    A29
HWRAS-25WX8    A30
HWRAS-25WX8    A31

HWRAS-25WX8 A32

REMOTE CONTROL ASSEMBLY

Summary of Contents for RAC-10SH1

Page 1: ...ROUBLE SHOOTING PARTS LIST AND DIAGRAM CONTENTS INDOOR UNIT OUTDOOR UNIT MARCH 2008 Hitachi Appliances Inc 5 6 18 20 22 23 26 27 34 35 37 66 70 94 OUTDOOR UNIT INDOOR UNIT Ć After installation RAS 10SH1 RAS 14SH1 RAS 10SH1 RAC 10SH1 TYPE MODEL POWER SOURCE TOTAL INPUT W TOTAL AMPERES A CAPACIT kW B T U h TOTAL INPUT W TOTAL AMPERES A CAPACITY kW B T U h W DIMENSIONS mm D g k NET WEIGHT DC INVERTER...

Page 2: ...e of any accident such as electrical shock leak of current or bodily injury due to the drop of any part 8 To check the insulation of the unit measure the insulation resistance between the power cord plug and grounding terminal of the unit The insulation resistance should be 1M or more as measured by a 500V DC megger 9 The initial location of installation such as window floor or the other should be...

Page 3: ... parts Even rejected goods should be handled in the same way 2 When any part is handled uncovered in counting packing and the like the handling person must always use himself as a body earth Make yourself a body earth by passing one M ohm earth resistance through a ring or bracelet 3 Be careful not to touch the parts with your clothing when you hold a part even if a body earth is being taken 4 Be ...

Page 4: ...circuits for maintenance inspection or some others be careful not to have the test probes of the measuring instrument shortcircuit a load circuit or the like Bare copper wire for body earth Metal plate of Al stainless steel etc Working table Resistor 1M 1 2W Earth wirte Staple Fig 3 Grounding of the working table soldering iron Grounding wire Screw stop at the screwed part using a rag plate ...

Page 5: ...is occasion that the cooling and heating operation does not start for 3 minutes it is not abnormal and this is the result of the operation of IC delay circuit This IC delay circuit ensures that there is no danger of blowing fuse or damaging parts even if operation is restarted accidentally 5 This room air conditioner should not be used at the cooling operation when the RXWVLGH WHPSHUDWXUH LV EHORZ...

Page 6: ...EFRIGERANT CHARGING VOLUME R410A PIPES SPECIFICATIONS REMOTE CONTROL SWITCH LIQUID CRYSTAL YES RAR 3U4 OUI RAR 3U4 NO NON FUSE CAPACITY RAS 10SH1 RAS 14SH1 25W DC35V NO NON NO NON NO NON NO NON YES OUI NO NON NO NON NO NON NO NON YES IC OUI IC RAC 10SH1 RAC 14SH1 40W DC380V EU1011E7 YES OUI YES OUI 3A G4A NO NON YES OUI NO NON 450NR NO NON NO NON WITHOUT REFRIGERANT BECAUSE COUPLING IS FLARE TYPE ...

Page 7: ... or fire PROHIBITION Do not put objects like thin rods into the panel of blower and suction side because the high speed fan inside may cause danger Do not bundle the power cable pull it put something on it heat it process it or put it between things Breakage of the power cable may result Use of a damaged cable may cause an electrical shock or a fire PROHIBITION PROHIBITION 3 HSILGNE 4 WARNING PREC...

Page 8: ...perating condition Remote controller Send out operation signal to the indoor unit So as to operate the whole unit ENGLISH 6 INDOOR UNIT INDICATORS FILTER LAMP When the device is operated for a total of about 200 hours the FILTER lamp lights to indicate that it is time to clean the filter OPERATION LAMP This lamp lights during operation The OPERATION LAMP flashes in the following cases during heati...

Page 9: ...is button after the batteries are replaced or when some irregular operation is found FUNCTION selector Use this button to select the operating mode Every time you press it the mode will change from AUTO to HEAT to DEHUMIDIFY to COOL and to FAN cyclically FAN SPEED selector AUTO SWING button TIMER control Use these buttons to set the timer EXTENDED AIRFLOW button Pushes air out further for an exten...

Page 10: ...s with a beep Press the button again to stop operation Press the FAN SPEED button AUTO and LOW is available As the settings are stored in memory in the remote controller you only have to press the START STOP button next time You can raise or lower the temperature setting as necessary by maximum of 3 C Press the temperature button and the temperature setting will change by 1 C each time The preset ...

Page 11: ...START STOP button next time START STOP Press the FUNCTION selector so that the display indicates DEHUMIDIFY The FAN SPEED is set at LOW or SILENT 1 HSILGNE Ultra quiet SILENT Press the START STOP button Cooling operation starts with a beep Press the button again to stop operation The cooling function does not start if the temperature setting is higher than the current room temperature even though ...

Page 12: ...e is cancelled and the AUTO SWING mode is set If the EXTENDED AIRFLOW button is pressed when the horizontal air deflector stops at your preferred angle the deflector will change to EXTENDED AIRFLOW As the angle of the horizontal air deflector changes the air may blow directly onto the body During stop operation press the button will activate dry function for several minutes to protect the heat exc...

Page 13: ...eating In this case the device will turn off in 2 hours at 1 38 a m and it will be turned on 6 00 next morning H AM H AM AM Sleep timer Start SLEEP HSILGNE 16 HOW TO SET THE TIMER ON OFF Timer The device will turn on off and off on at the designated times The switching occurs first at the preset time that comes earlier The arrow mark appearing on the display indicates the sequence of switching ope...

Page 14: ...ing and the RESERVED sign lights A beep occurs and the TIMER lamp lights on the indoor unit 3 Point the signal window of the remote controller toward the indoor unit and press the RESERVE button The ON mark starts lighting instead of flashing and the RESERVED sign lights A beep occurs and the TIMER lamp lights on the indoor unit 2 Set the turn on time with the TIMER control button Example The devi...

Page 15: ...of time Occasionally open the door and windows to allow the entrance of fresh air THE IDEAL WAYS OF OPERATION HSILGNE 20 FOR USER S INFORMATION The Air Conditioner And The Heat Source In The Room Not Operating For A Long Time When Lightning Occurs Caution If the amount of heat in the room is above the cooling capability of the air conditioner for example more people entering the room using heating...

Page 16: ... from the air filter and air cleansing filter using vacuum cleaner If there is too much dust air filter only rinse under running tap water and gently brush it with soft bristle brush Allow filters to dry in shade 3 Re insert the air cleansing filter to the filter frame Set the filter with FRONT mark facing front and slot them into the original state After attaching the filters push the front panel...

Page 17: ...the inside to release it and while closing the front panel slightly put it out forward Attaching the Front Panel Move the projections of the left and right arms into the Flanges in the unit and securely insert them into the holes Arm Projection Hole Flange HSILGNE 24 1 2 3 REGULAR INSPECTION PLEASE CHECK THE FOLLOWING POINTS BY QUALIFIED SERVICE PERSONAL EITHER EVERY HALF YEARLY OR YEARLY CONTACT ...

Page 18: ...he various odor emitted by smoke foodstuffs cosmetics and so on sticks to it So the air filter and the evaporator regularly must be cleaned to reduce the odor Please contact your sales agent immediately if the air conditioner still fails to operate normally after the above inspections Inform your agent of the model of your unit production number date of installation Please also inform him regardin...

Page 19: ...l Top air suction grill 47 5 60 20 Cabinet Front panel 314 208 208 0 4 2 0 4 2 70 about 370 Drain Drain hose Wide pipe Narrow pipe Drain cap connection port When piping is drawn from the left side exchange the drain hose and the drain cap 5 147 60 20 47 56 17 5 Mounting plate 47 32 60 19 60 22 47 Vertical air deflector 198 ...

Page 20: ...dle Air Suction grill Air outlet Handle Holes for anchor bolt 2 ø12 x 6 slots for ø8 0 bolt for 2 ø8 0 bolt Notch for anchor bolt Fixing hole Drain hole Drain hole Service space More than 50 More than 100 More than 200 More than 300 Rear side ...

Page 21: ...15 3 59 5 17 3 63 1 ON 23 7 74 7 24 7 76 5 OFF 23 3 73 9 25 3 77 5 ON 31 7 89 1 32 3 90 1 OFF 31 3 88 3 32 7 90 9 TEMPERATURE INDICATION 16 INDICATION 24 INDICATION 32 CONNECTION Û Û Û Û Control circuit built in Control circuit built in M WHT RED YEL 0 5V 0V 35V 5V BLU BLK M BLK RED WHT 15V 120 380V 0 6 5V 0V YEL BLU BLU BLUE YEL YELLOW BRN BROWN WHT WHITE GRY GRAY ORN ORANGE GRN GREEN RED RED BLK...

Page 22: ...U WHITE YELLOW RED V M M M W RAC 10SH1 RAC 14SH1 L E D O M 11E7 0 1 U E L E D O M R O S S E R P M O C E L P M I S L G N I S E S A H P V 350 220 C D E G A T L O V D E T A R z H 0 6 0 5 Y C N E U Q E R F D E T A R 4 R E B M U N E L O P Û Û Û Û 2M 1 069 2M 1 300 WHITE YELLOW RED ...

Page 23: ... CN11 M CN10 CN3 CN7 CN9 4 3 2 1 CN2 9 CN2 INDOOR FAN MOTOR RED BLK WHT YEL BLU GRY WIRELESS REMOTE CONTROL CONTROL P W B WIRED REMOTE CONTROL H LINK 1 2 3 4 5 6 12V Rx Tx 0V 0V 12V Rec Send M CN1 GRY CN4 AUTO SWEEP MOTOR2 AUTO SWEEP MOTOR1 INDICATING TEMPORARY SW AND LIGHT RECEIVING UNIT P W B BLK BLK 11 M 4 D C BRN RED CONNECTING TERMINAL BOARD CORD BRN GRN YEL HEAT EXCHANGER THERMISTOR ROOM THE...

Page 24: ... 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 9 G E S 8 G E S 7 G E S 6 G E S 5 G E S 4 G E S 3 G E S 2 G E S 1 G E S 0 G E S C C V F E R V S S V A 3 M O C 2 M O C 1 M O C 0 M O C 3 L V 2 L V 1 L V 1 6 2 6 3 6 4 6 5 6 6 6 7 6 8 6 9 6 0 7 1 7 2 7 3 7 4 7 5 7 6 7 7 7 8 7 9 7 0 8 ˬ ˍ ˬ ˍˎ ˌˊˍȝˢ ˮˍˎ ˎˎˌ ȍ R1 3 3ȍ 1 8W R2 3 3ȍ 1 8W R3 3 3ȍ 1 8W R4 3 3ȍ 1 8W ˮ ˎˎˌȍ ˮ ˍ ȍ ˮ ˎ ˎ ȍ ˎ ˎ ˏːːˏ ˍ ˎ...

Page 25: ... 8W 1 6W R752 R753 R754 R755 10K 1 16W C 10K 1 16W C 2K 1 16W C R768 1 16W 1K C R763 10K 1 16W C R756 1K 1 16W C R757 1K 1 16W C R758 5 1K R551 1M 1 16W R552 1K 1 16W R652 1 16W 100 10K 1 16W R611 1K R601 1K R621 1 16W R701 1K 1 16W R656 1 16W R654 10K R655 1 16W 10K 1K R631 1K R721 3 3K 1 16W R602 R641 1 16W 10K 1K R651 1 16W 1K R653 1 16W 1K C C C C A C C C C C C C C C C C 1 8W 1 4W 1 8W 1 8W R6...

Page 26: ... 5ĳ 1 16 1 16 1 16 R254 R255 R256 10K 5 1K 5ĳ 1 6 M R114 1K 390 390 390 1M 10K 510 5ĳ 100 100 5ĳ 5ĳ 100 5 6K 1K 10K 3 16K 2K 20K 3 32K 100 5ĳ 2K 10K 5ĳ 5ĳ 1K 1K 2K 2K R010 5ĳ 1 2 M 10 R115 M WIREJUMPER 5 2 R001 470K 5ĳ M 1 2 R005 1 69K 1 6 M 1ĳ R200 1K 5ĳ 1 16 R219 1K 5ĳ 1 16 R224 1K 5ĳ 1 16 R225 1K 5ĳ 1 16 R199 1K 5ĳ 1 16 1K 5ĳ M 1 6 30K R103 5ĳ M 1 6 3 9K R104 1ĳ R105 7 5K 5ĳ 1 6 M 10K HIC HIC H...

Page 27: ...ay Power module Inrush current Protection circuit ACT Power circuit L N Power source 1 ĳ 50Hz 220 230V Outdoor DC fan motor SPM2 DC compressor motor FM M Trip signal synthesis circuit Upper arm drive circuit Lower arm drive circuit Electric Expansion valve drive circuit Peak current cut off DC current signal Rotor magnetic pole position detection circuit Peak current cut off circuit Overload contr...

Page 28: ... Ultra Lo Lo or Stop depending on the room temperature and time Set to Stop if the room temperature is 18 in the Ultra Lo mode other than during preheating cooling is recovered at 18 33 The fan speed is controlled by the heat exchanger temperature the overload control is executed as in the following diagram Heat exchanger temperature KAFON KAFOF Med with overload Lo On On Off 27 Operating mode is ...

Page 29: ...3150 4000 2800 3300 2500 2800 2500 2800 3300 3800 2050 3350 1800 2500 1700 2000 1600 1700 1700 2000 1400 1400 2200 2200 1500 1500 1400 1400 1400 1400 1400 1400 5 5 1800 1800 3000 3000 0 0 0 0 60 60 90 90 90 90 0 0 0 0 400 400 1 0 1 0 3 3 1 66 1 66 2 00 2 00 1 33 1 33 1 00 1 00 1900 1900 5 00 5 00 9 00 9 00 43 43 43 43 43 43 60 60 60 60 30 30 60 60 0 0 2000 2000 1300 1300 1300 1300 700 700 90 90 30...

Page 30: ... have elapsed after cool dash was started 2 when the room temperature reaches the cooling set temperature 1Û including cooling shift and then becomes lower than the preset temperature by 0 66Û after the steady speed period 3 when thermo is OFF if cool dash finished in the above 1 the compressor does not go through the steady speed period but it starts fuzzy control 3 The thermo OFF temperature dur...

Page 31: ...e even when the fan speed mode is changed 5 When operation is stopped during sleep operation the set temperature when stopped as well as the time continue to be counted 6 If the set time is changed during sleep operation all data including set temperature time etc is cleared and restarted 7 If sleep operation is canceled by the cancel key or sleep key all data is cleared 8 The indoor fan is stoppe...

Page 32: ... Outdoor fan Indoor fan Timer lamp Sleep key Operation lamp SLEEP on the remote controller is lit Hi Med Lo Sleep Silent Facing up Horizontal Shut Set to 2 hours Lo S 1 h r 2 h r 0 5 h r Dehumidifying Notes 1 The sleep operation starts when the sleep key is pressed 2 When the sleep key is set the indoor fan is set to Sleep Silent FDOY 3 If the operation mode is changed during sleep operation the s...

Page 33: ...ot dash is heating set temperature including heating shift plus 3 After thermo OFF hot dash finishes and fuzzy control starts 4 The compressor minimum ON time and minimum OFF time is 3 minutes 5 The time limit for which the maximum compressor speed WMAX or WMAX2 during normal heating except for hot dash can be maintained is less than 120 minutes when the room temperature is 18 or more it is not pr...

Page 34: ...re is no preset temperature shift due to time elapse Heating Sleep Operation 1 min WMIN DFMAX Compressor speed TDF 411 TDF 412 TDF 413 TDF421 WMAX TDF 431 STARCPL STARCPL 4000min 1 4000min 1 TDF 422 Notes 1 The defrosting inhibit period is set as shown in the diagram below When defrosting has finished once the inhibit period is newly set based on the outdoor temperature when the compressor was sta...

Page 35: ...INDOOR HEAT EXCHANGER ĳ ĳ ĳ ĳ ĳ OUTDOOR UNIT Silencer Silencer Strainer Strainer Strainer Reversing valve Charge port COMPRESSOR Service valve Service valve Electric expansion valve Air flow Air flow OUTDOOR UNIT Silencer Silencer Strainer Strainer Strainer Reversing valve Charge port COMPRESSOR Service valve Service valve Electric expansion valve Air flow Air flow ...

Page 36: ...of the front cover towards you as shown in the figure and remove the cover 3 Control Board Assembly 1 Take out electrical assembly cover by push the hook 2 Disconnect each lead wires and the screZ WKDW xed earth wire to electrical box 3 Remove the screZ WKDW xed electrical box to the water gutter 4 Pull forward the bottom portion of electrical assembly and take out Front Panel Locking mechanism 3 ...

Page 37: ...s till they stop After checking that the shafts are securely inserted close the panel 7 Firmly insert the front panel arms by sliding along the steps located at the main body 8 Slide the front panel locking mechanisms left and right into the slots located at the main body untill you hear a clicking sound 5 Fan Motor 1 Remove the screZV WKDW xed fan cover at the right side of Evaporator 2 Hold the ...

Page 38: ... ˍ ˍ ˎ ˏ ˍ ˎ ˎ ˉ ˬ ˉ 14 40 Power to operate indoor unit DC35V is generated at the power supply in outdoor unit and it is sent to indoor unit through the connecting cord C and D Then DC 12V 12V line is generated using DC DC converter from the voltage sent from outdoor unit as the control voltage of 12V is required to drive the auto sweep motor and others Furthermore 5V 5V line which is necessary to...

Page 39: ...set input is Lo for resetting and Hi for heating Waveform of each part when switching ON the power and when shutting down is shown in the Fig 2 2 After switching ON the power ķ pin of IC521 supply voltage and Ľ pin of microcomputer becomes Hi when DC5V line rises and reaches approximately 4 4V or higher Then resetting will be cancelled and microcomputer starts operating After shutting down the pow...

Page 40: ...g 3 2 A 0V 0V 5V 20 2 0 1 0 3 4 5 40 10 30 10 R302 C303 R306 63 4 Heat Exchanger Thermistor Circuit Heat exchanger temperature is noticed inside the room 1 Preheating 2 Low temperature defrosts at cooling dehumidification operation time 3 Not working of reversing valve or detection of opening of heat exchange thermistor is controlled According to heat exchange temperature the voltage of point beco...

Page 41: ...on is outputted from the fan motor and input to micro computer pin The frequency of this pulse is 12 60 of the number of rotations Ex 1000min 1X 12 60 200Hz The microcomputer observes this frequency and to make it as the instruction number of rotation all the time adjusts the output pulse width of pin If the feedback pulse becomes lower than 100min 1 caused by lock or failure of a fan motor the fa...

Page 42: ...oscillates to generate the buzzer s sound 30 0V Q722 R219 12V Fig 6 1 Buzzer Circuit Fig 7 1 Fig 6 2 Buzzer Operation Metal diaphragm Piezoelectric element V Sound wave Microcomputer Buzzer output BZ 30 V 7 Receive Circuit The light receiving unit receives an infrared signal from the wireless remote control The receiver amplifies and shapes the signal and outputs it WIRELESS INPUT Microcomputer R6...

Page 43: ...er is turned off Fig 8 1 Microcomputer External ROM SCL SDA 0V 0V 0V 5V 5V 5V C401 IC401 E2 PROM R404 R403 27 26 1 2 3 4 8 7 6 5 9 Temporary Switch Circuit The temporary switch is used to operate the air conditioner temporarily when the wireless remote control is lost or faulty The air conditioner operates in the previous mode at the previously set temperature However when the power switch is set ...

Page 44: ... parts for the outdoor unit is composed of two P W B a power P W B and main P W B and a harmonics improvement circuit as shown in Fig 1 1 Main P W B This P W B is equipped with the rectification diode DC fan motor control circuit and the circuits around the micro computer which take various controls POWER P W B This P W B is equipped with the noise filter ICP power circuit interface circuit smooth...

Page 45: ... DB3 L1 C023 and L2 The DB3 L1 C023 and L2 shape waveform of the input current When the current runs through the L1 is taken for I1 and the current runs through the L2 is taken for I2 as shown in Fig 2 2 I1 becomes an input current to the capacitor which peak value was crushed by the L1 and I2 becomes a resonance current which causes the LC resonance using the L2 and C023 By combining the I1 and I...

Page 46: ...y absorb electrical noise generated during operation of compressor and also absorb external noise entering from power line to protect electronic parts Be sure to connect the earth cable between the indoor unit and the outdoor unit Otherwise the noise filter circuit won t operate properly 6 SA1 and VS1 to VS3 These surge absorber and varistors absorb external power surge such as induced thunder Be ...

Page 47: ...request signal The receiving circuit in the indoor unit consists of a comparator and transistor The interface signal from the outdoor unit on the DC 35V line is supplied to C821 where DC components are eliminated and is then shaped by the comparator The shaped signal is detected by diode amplified by amp and output to pin of the indoor microcomputer Fig 3 2 shows the waveforms at each component wh...

Page 48: ...rom outdoor microcomputer to indoor microcomputer Communications from indoor microcomputer to outdoor microcomputer Fig 2 1 Indoor outdoor interface Circuit Fig 2 1 shows the interface circuit used for the indoor and outdoor microcomputers to communicate with each other I F Reception Microcomputer I F Transmission ...

Page 49: ... Waveforms of indoor Outdoor Microcomputers Outdoor to Indoor Communications Fig 3 3 Voltages Waveforms of indoor Outdoor Microcomputers Indoor to Outdoor Communications Indoor microcomputer Pin Pin 35V DC line Indoor microcomputer Pin Pin 35V DC line 0V 5V 0V 0V 35V Outdoor microcomputer Pin Pin 11 68 Outdoor microcomputer Pin Pin 11 68 ...

Page 50: ...mputer to outdoor HIC 3 Communications waveforms Leader 100ms Leader 100ms When reset approx 100ms When reset approx 10ms 35 V 34 V 36 V 0 7 0 7 7 7 0 33 3ms 3 2 1 Character No 0 Bit No 0 Fig 3 4 7 0 7 0 7 0 7 Bit No 0 3 2 1 33 3ms 33 3ms 33 3ms Transmit receive switching time 4 95ms 33 3ms 33 3ms Outdoor message Indoor message 33 3ms 33 3ms 0 Character No 1 frame 100ms 33 3ms 8 4 95ms 371 35ms ...

Page 51: ...stic 1 Autodiagnostic 0 LSB Température extérieure 0 LSB Compresseur pendant opération Vitesse de commande du compresseur 0 LSB Vitesse minimum de rotation du compresseur 0 LSB Vitesse minimum de rotation du compresseur 1 Vitesse minimum de rotation du compresseur 2 Vitesse minimum de rotation du compresseur 3 Vitesse minimum de rotation du compresseur 4 MSB Vitesse de commande du compresseur 1 Vi...

Page 52: ...nt power module and its peripheral circuit The three transistors on the positive E side are called the upper arm and the three transistors on the negative D side the lower arm Fig 4 1 Intelligent power module circuit U is ON V is ON IP limitter E E E Microcomputer ...

Page 53: ...ula below N 60 2 X 1 T Fig 4 3 shows voltage waveform at each point shown in Fig 4 1 and 4 4 First half of upper arm is chopper second half is ON and first half of lower arm is chopper second half is ON Fig 4 3 Voltage waveform at each point When power is supplied U V because of that U is chopped current flows as shown below 1 When U transistor is ON U transistor U coil V coil V transistor DC curr...

Page 54: ...proportional to the input current of the air conditioner input current is controlled by using DC current Id detection resistor Reference If power module is defected self diagnosis lamps on the MAIN P W B may indicate as shown below Fig 4 5 Table 4 1 B B B Ip peak current cut LD301 Blinks 2 times Blinks 3 times Blinks 4 times LD301 LD301 Self diagnosis Self diagnosis lamp and mode Abnormal low spee...

Page 55: ...l peak current was detected while the inverter is driving the IPM outputs the Fail signal immediately from the pin and forces the lower arm transistor to shut off at the same time In this step the Q501 is turned on and the input signal of the upper arm is also shut off through the D501 and D502 so that all signals to the IGBT are shut off This signal is also distributed to microcomputer pin as a L...

Page 56: ...ply for microcomputer peripheral circuits Microcomputer and IPM driver circuit and as well as DC 35V are produced by switching power circuit Switching power circuit performs voltage conversion effectively by switching transistor IC1 to convert DC 330V voltage to high frequency of about 20kHz to 200kHz AC220 230V ...

Page 57: ... normal Check the removed loads If any error is found in this step the power circuit has any failure Replace the power P W B A short circuited load may cause an output error not only in the load but also in the others Be sure to check all outputs of the loads Be sure to wait 15 minutes or more in order to discharge all the remaining voltage in the circuit to connect disconnect the wiring other wis...

Page 58: ...imiting the whole input of this room air conditioner system through the current sensor CT1 in order to keep the maximum rating of components by reading total operating current ID OVL is watching and limits the compressor current through the detection resistor which is built in IPM in order to control the compressor reliability Since the compressor reliability is related with its speed the ID OVL v...

Page 59: ...y the current flowing to Detection resistor R245 and C217 average the voltage This voltage is then input to IC4 pin and supplied to microcomputer pin The microcomputer compares this input with the set value and if the input exceeds the set value it enters overload control status The set Value is determined by the amplification of the voltage amp circuit Amplification high DC current low Amplificat...

Page 60: ...tart of the DC motor of the compressor RAC 25FX8 and RAC 35FX8 use software to control the start current The start current varies when the supply voltage varies This control method copes with variations in the voltages as follows 1 Turns on the power module s U and V transistors so the current flows to the motor windings as shown in Fig 6 6 2 Varies the turn ON time of the U transistor according t...

Page 61: ...e voltages rise and 12V line voltage reaches 10 9V an reset voltage input to pin of microcomputer is set to Hi Reset voltage will be hold Hi until the 12V line voltage drops to 9 90V even though the power shuts down Fig 6 7 Fig 6 8 48 48 12V line Power is ON Voltage V Power is OFF Voltage V 5V line 10 9V Time Time 9 9V Reset voltage Reset voltage 12V line 5V line 12 6 0 12 6 0 0V RESET 12V MAIN P ...

Page 62: ...ting operation the microcomputer transfers the defrosting condition command to the indoor microcomputer via the circuit interface The microcomputer always reads the outdoor temperature via a thermistor microcomputer pin an transfers it to the indoor unit thus controlling the compressor rotation speed according to the value set at the EEPROM in the indoor unit and switching the operation status out...

Page 63: ...in Table 8 1 when measured by multimeter 1 0 7 Q f o e g a t l o v r o t c e l l o C n o i t i d n o c n o i t a r e p O Cooling General operation of Cooling In normal heating operation Defrosting Sensor dry MAX rotation speed instructed by indoor microcomputer after defrost is completed Heating Dehumidifying About 0 8V About 0 8V About 0 8V About 35V About 35V Table 8 1 V 4 6 6 CN2 POWER P W B Re...

Page 64: ...pprox 0 9 V is applied to the CN15 and the pins ķ to ĺ and when no po wer is supplied 12 V is applied When the power is reset the expansion valve starts initial operation for 5 to 10 seconds During the initial operation measure each pin of the CN15 ķ to ĺ with a multimeter If no change is found around 0 9 V or 12V in this step the expansion valve or the microcomputer has failure The logic waveform...

Page 65: ...C209 Fan motor will start to rotate when Vsp was proceeding over than 1 7V and generate FG pulse by rotation speed FG pulse will feed back to Outdoor microcomputer DC Fan Motor circuit has to match the Fan Motor revolution with instructed revolution Such as FG feedback Faster Instruction Slower Decrease pulse width FG feedback Slower Instruction Faster Increase pulse width FG pulse is also used fo...

Page 66: ... growing inside of outdoor unit by snowing It may make Fan Lock Stop by strong wind ex 17m sec or above against the Fan rotation In this case unit will be restart again after a while In case of Fan Lock Stop even though the DC Fan Motor is rotating correctly the possible cause in Fan Motor problem or control board problem Stop after the Fan motor runs 2 minutes Fan Motor may be broken Caution Plea...

Page 67: ...is actually Weak At the beginning of heating the fan speed remains LOW for 30 seconds If HIGH is elected it switches to LOW and again to MED after additional 30 seconds Heating operation stops while the temperature is preset at 30 If temperature is high in the outdoor heating operation may stop to protect internal devices Normal sound when refrigerant flows in pipe Compressor may not operate when ...

Page 68: ...operation section It is automatically set as follows At cooling and heating Set at 22 C The room temperature setting can be raised 3 C by or lowered 3 C by When on timer has been programmed operation starts before the preset time has been reached Does Nice temperature reservation function operate during dehumidifying Even if the same time is preset the operation start time varies This is because N...

Page 69: ...lattice door as possible so that air is not short circuited or provide a partition between the unit and lattice door OTHERS Q1 A1 The indoor fan varies among high air flow low air flow and breeze in the auto fan speed mode Heating operation This is because the cool wind prevention function is operating and does not indicate a fault The heat exchanger temperature is sensed in the auto fan speed mod...

Page 70: ...ion of the interior of the indoor unit varies depending on usage of the unit and condition of the indoor unit If it is not dried after the first try perform the drying more than one time for better effect To perform the air conditioner drying stop the unit operation or programming beforehand Check to see if warm cool air is being short circuited behind the lattice door A short circuit is likely to...

Page 71: ...e never ground it Don t forget that high voltage as noted in the figure above may apply to the oscilloscope Remember that voltage of 175 V is applied to the 0V line on the P W B or the like as shown in the right diagram Indoor Controller Outdoor Controller Power Switch Point 400 F M P I Compressor motor Point line Control P W B Main P W B Voltage at point A Ground voltage Grounding 350V Point B 0V...

Page 72: ...ntinuity check for each circuit part of the outdoor unit be sure to discharge the smoothing capacitors Discharge Procedure 1 Turn off the power of the indoor unit or pull out the power supply plug 2 After power is turned off wait for 10 minutes or more Then remove electrical parts cover and apply soldering iron of 30 to 75 W for 15 seconds or more to TAB3 GRAY and TAB4 RED terminals on the main P ...

Page 73: ...es gate G gate drive circuit and 0V line Q111 will be turned on continuously over current will flow and ICP1 may be blown causing trouble in Q111 When switching waveform of Q111 is to be observed measure gate G and drain D with source S as base point 2 CN3 Power CN10 Fan Motor CN13 Temporary switch P W B and CN4 Indicating P W B are connectors with lock mechanism Release lock with finger before di...

Page 74: ...as been performed several times Note In some failure modes only the retry operation is repeated without lamp indication Failure modes that will repeat a retry operation without the indoor unit lamp indication are as follows OH thermistor temperature rise Outdoor unit communication error Power voltage abnormal Less frequent defects The LD301 indicates a mode of failure detected on the outdoor unit ...

Page 75: ...use the remote control for operation except for mode marked Ć Ć1 Once 2sec 2 Times 3 Times 9 Times 13 Times 2sec 2sec 2sec 2sec IC401 defective Reversing valve defective Forced operation of outdoor unit Indoor Outdoor interface defective e v i t c e f e d n i a M e d o m g n i k n i l b p m a L Indoor sensor defective 4 Times 2sec Outdoor defective indication 10 Times 2sec Abnormal rotating number...

Page 76: ... 75 SELF DIAGNOSIS LIGHTING MODE MODEL RAC 10SH1 RAC 14SH1 ...

Page 77: ...ning KHck if the connecting cable connected incorrectly inserted incompletely or disconnected Not running Running Open the outdoor unit and observe the self diagnosis ODPS RXQW Kow many times the lamp blinks Blinks other than 1 time Blinks 1 time DQ WKH XQLW EH RSHUDWHG XVLQJ WKH RXWGRRU XQLW service switch 6HH WKH QDPHSODWH RQ WKH RXWGRRU XQLW for operating instructions KHck the outdoor electrica...

Page 78: ...wer cable power switch and terminal board and repair any defective part Check the indoor outdoor unit connection cable and correct any defective section wrong connection incomplete insertion Is AC220 230V being generated between terminals A and B on the outdoor unit terminal board Is DC35V being generated between terminals C and D on the indoor unit terminal board Is the microcomputer reset input ...

Page 79: ...inal operation check 3 Air deflector does not move others are normal Replace the microcomputer Is a voltage over 15 or below 10V being generated on the 12V line Replace IC111 Yes Yes Yes Yes No No No No Check IC711 If it is normal replace the air deflector motor Perform final operation check 40 Are pulse signals output at microcomputer pins Auto Sweep 1 Auto Sweep 2 when auto swing is turned on in...

Page 80: ...121 are defective If shorted defective ICP1 will be open again Replace the terminal board Insert the connection cable securely Replace IC121 Check if a short occurs in the 5V line If the 5V line is shorted ICP1 will be open again Check to see if the connection cables are disconnected or reversed If normal check the outdoor unit P W B Has the terminal board thermal fuse blown open Replace Q111 and ...

Page 81: ... The sensible area should flash in orange when you operate the remote control unit if it is good Ultra redray test card Sensible area Within 2 cm Check functions again If it does not work replace the remote controller Buzz Within 15 cm AM radio Check the LED D1 with a multimeter Replace the battery Install the battery in the correct polarity Yes Yes No No No Yes Does the radio buzz noisily Is batt...

Page 82: ...AUTIONS FOR SERVICING Be sure that the power switch is turned off or the power cable is disconnected before servicing Removing the P W B System Configuration of Outdoor Unit Electrical Parts The outdoor unit electrical parts consist of two P W B as shown in the figure Main P W B M board Contains a rectifier circuit and inverter module their controlling microcomputer and microcomputer peripheral co...

Page 83: ...ment capacitor Designed to improve power factor To replace the capacitor remove the power P W B and then 1 Remove two screws fastening the capacitor seat 2 Slide the capacitor seat in the direction of the arrow Sliding Direction ...

Page 84: ... parts may also be defective Replace defective parts Is the power circuit normal See the description on power circuit for details Is the switching power circuit OK Has the 3A fuse blown Check to see if C and D cables are connected correctly If reversed or incompletely inserted correct the cable connection Replace any defective parts If the 3A fuse has blown the varistor 2 etc may also be defective...

Page 85: ...r P W B Is the fan operating An error occurs after the fan operates for 2 minutes Is the voltage between ĺ and ļ at CN24 normal Normally the voltage is above approx DC1 7V Connect the connector Remove any obstructions Replace the fan motor and main P W B Is the voltage between ĺ and Ľ at CN24 normal Check to see if the voltage is within 2 5V 0 5V using a tester In effect the output voltage is alte...

Page 86: ...n the terminal board Apply AC220 230V Check the interior wiring Are TAB 1 TAB 2 TAB 3 TAB 4 TAB 5 TAB 6 TAB 11 TAB 12 reactor and C023 yellow green connected properly Connect properly Replace the power P W B Possible causes include Power relay malfunction Defective microcomputer terminal Yes Yes Yes No No No ...

Page 87: ... Is DC35V being output between terminals C and D Normal DC32V 39V Is DC35V being output at both ends of R35 Connect CN 3 and CN4 Connect properly Replace the power P W B Defective SW power supply Replace the power P W B NF coils IF coils etc may be broken Check the interface circuit and replace the main P W B if needed Yes Yes Yes s e Y s e Y No No No No No ...

Page 88: ...tting to connect after servicing Is the continuity of the thermistor normal Is the thermistor circuit normal Connect the thermistor Replace the thermistor Replace parts in the thermistor circuit Check continuity of pattern and lead wires according to the P W B and schematic diagrams s e Y s e Y Yes No No No No ...

Page 89: ...ilter Check the outdoor unit for defective shielding LD301 blinks 4 times Failure of switching Is the 15V power supply output normal Power P W B display Is the intelligent power module IPM normal Inverter section The intelligent power module may be defective Replace the main P W B See System Power Module Diagnosis With CN3 and CN4 disconnected is the 15V output between 15V and 15 0V on the power P...

Page 90: ...in P W B LD301 blinks 1 time Reset stop However the unit always resets and stops just after power is supplied this does not indicate a fault Is the reset circuit normal Normally pin Ľ of CN18 is approx 5V Replace the main P W B Make sure again that connectors are connected securely Perform final operation check Yes Yes Yes No No ...

Page 91: ...tive Replace it and seal refrigerant If the compressor checker for an inverter type air conditioner is available re check using it JUDGING BETWEEN GAS LEAKAGE AND COMPRESSOR DEFECTIVE Blinking off Time until the lamp lights Approx 10 seconds Approx 10 seconds Approx 10 seconds Within Approx 30 minutes Compressor Compressor Gas leakage Possible malfunctioning part LD301 Self diagnosis lamp Lighting...

Page 92: ... will blink 4 times Be sure to push the service switch for a second again to stop the forced cool operation HOW TO OPERATE THE OUTDOOR UNIT INDEPENDENTLY 1 Connect the large dia pipe side and small dia pipe side service valve using a pipe Parts to be prepared 1 Reducing union 2 8 6 35 mm 3 8 9 52 mm 2 Copper pipe 2 8 and 3 8 Connect the small diameter service value and the large diameter service v...

Page 93: ...ircuit diagram of the device Circuit diagram of the module Terminals symbol mark of the module See next page for measuring value using multimeter Collector Emitter RASF IPM Intelligent Power Module DIAGNOSIS ...

Page 94: ... battery connection inside note Sometimes it may misjudge as OK because of low conductivity when power module was damaged as disconnect mode In this case please check the resistance by reversing the probe polarity and consider OK when it was low resistance Also it is OK if the resistance was as same as the other phases U V W Driver circuit internal IC 15V will not be generated when the internal IC...

Page 95: ... 94 PARTS LIST AND DIAGRAM MODEL RAS 10SH1 RAS 14SH1 25 24 12 6 2 30 26 9 11 31 27 10 28 32 29 13 14 15 7 21 22 5 8 23 1 4 17 3 20 19 18 16 ...

Page 96: ...R FILTER RIGHT AIR FILTER LEFT LOWER COVER RIGHT B LOWER COVER RIGHT W LOWER COVER LEFT B LOWER COVER LEFT W MOUNTING PLATE REMOTE CONTROL SUPPORT 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 HWRAS 25WX8B A06 HWRAS 25WX8 A23 HWRAS 25WX8 A24 HWRAS 25WX8 A25 HWRAS 25WX8 A20 HWRAS 25WX8 A21 HWRAS 25WX8B A05 HWRAS 25WX8 A22 HWRAS 25WX8B A03 HWRAS 25WX8 A18 HWRAS 25WX8B A04 HWRAS 25W...

Page 97: ...8 29 30 31 32 GEAR ASSEMBLY AUTO SWEEP MOTOR GEAR LIMIT SWITCH IONIZER UNIT IONIZER CASING THERMISTOR SUPPORT SCREW CAP B SCREW CAP W HWRAS 25WX8B A07 HWRAS 25WX8 A33 HWRAS 25WX8 A26 HWRAS 25WX8 A27 HWRAS 25WX8 A28 HWRAS 25WX8 A29 HWRAS 25WX8 A30 HWRAS 25WX8 A31 HWRAS 25WX8 A32 REMOTE CONTROL ASSEMBLY 1 33 ...

Page 98: ... 97 MODEL RAC 10SH1 RAC 14SH1 30 46 44 47 42 43 45 31 41 38 36 37 35 39 34 32 32 40 25 26 27 28 29 5 33 51 21 19 23 24 22 1 49 48 50 4 3 2 15 12 16 10 11 13 6 8 14 7 20 17 18 52 9 ...

Page 99: ...IPE COVER CAPACITOR CORD ASSEMBLY RAC 10SH1 RAC 14SH1 MODEL RAC 10SH1 RAC 14SH1 NO PARTS NO Q TY UNIT PARTS NAME HWRAC D10EX2 A01 HWRAC 25YH4 A02 HWRAC 25YH4 A03 HWRAC 25YH4 A04 HWRAC D10EX2 A02 HWRAC D10EX2 A03 HWRAC 25YH4 A07 HWRAC D10EX2 A04 HWRAC D10EX2 A05 HWRAC 25YH4 A10 HWRAC 25YH4 A11 HWRAC 25YH4 A12 HWRAC D10EX A08 HWRAC 25YH4 A14 HWRAC 25YH4 A15 HWRAC D10EX2 A07 HWRAC 25YH4 A17 HWRAC 25Y...

Page 100: ...HHAW 0017E RAS 10SH1 RAC 10SH1 RAS 14SH1 RAC 14SH1 ...

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Hitachi RAC-10SH1, Service Manual

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